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Thread: LS 2 stuck in limp mode in my 55 wagon

  1. #1
    Junior Member
    Join Date
    Oct 2019

    Member #:4257

    LS 2 stuck in limp mode in my 55 wagon

    HELP i just installed a 06 gto LS2 and 4l60 trans in my 55 using gto harness car runs but check eng lite on code co101 [transmission not communicating] drove donor car before removal ran fine had pcm and tcm flashed. car runs but has zero power and is in 2 nd gear through which wire or wires does the tcm talk to pcm what may i have messed up in wiring in gto harness and leads for help appreciated im in ca la area

  2. #2
    Registered Member WagonCrazy's Avatar
    Join Date
    Mar 2012

    Member #:530
    Santa Clarita, CA
    if you can get your hands on an 06 GTO wiring diagram, that might give you some clues as to where to start checking (pcm and tcm wiring).
    Not sure what else to advise at this point.
    1957 Nomad- LS1/T56 on C4 chassis
    1959 Fleetside Apache 1/2 ton, shortbed, big window, 327ci.

  3. #3
    Registered Member
    Join Date
    Apr 2012

    Member #:571
    Unless you find something obvious, like a missing or broken wire or a pushed terminal in a connector, you are probably going to need to put a scanner on it to see what is happening real time.

  4. #4
    Registered Member Old Buzzard's Avatar
    Join Date
    Jan 2017

    Member #:3292
    Bostwick, Georgia


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